The Ontario Building Code | Emergency Air Supply
3.14.2.6. Emergency Air Supply
(1) An air-supported structure designed for an assembly occupancy with an occupant load of more than 200 persons shall have either an automatic emergency engine-generator set capable of powering one blower continuously for 4 h, or a supplementary blower powered by an automatic internal combustion engine.
In Plain Language
An air-supported structure used for assembly occupancy with an occupant load over 200 must have either an automatic emergency generator capable of running a blower continuously for 4 hours, or a supplementary engine-powered blower.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.